"I want to have 100 kids," Levine joked. "I want to have more kids than is socially responsible. We can't do it right now, but it's in the works."

As he starts a family, PEOPLE's reigning Sexiest Man Alive says that his work with Maroon 5 may slow down.

"We want to tour, to a certain degree, forever," he said, "but at which point does this start to interfere with other things in life that you want to do? There's probably a day when I'm working a lot less and enjoying my job a little more."

The veteran rock band will release its fifth album, V, on Sept. 2. Levine told Seacrest that fans should expect "more depth."